A replacement for the knobs on the side that allow you to rotate the fan up and down. Threads are a snug fit, let me know if I need to loosen them up.
Material: PLA is probably fine.
Settings: 0.4mm nozzle, 0.2mm layer height, no supports and no brim. Two perimeters, 20% grid infill.
The author hasn't provided the model origin yet.